Best hosta's to put with impatiens

I have an oak tree - fairly large - 22" diameter. Around the base of it I
plant a large circle of impatiens - usually red - each year.. On the north
facing side of the tree I have had several hosta Royal Standard plants for a
number of years. They have never really done very well in that spot, probably
due to the low sunlight they receive - virtually none but filtered light.
My question is this: What are several hostas that will do better in this low
light than the Royal Standards, and also look good with the impatiens. It
could be severalof one variety, or several varieties together..
Any ideas?? Thanks for the help..
Ronnie
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